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98 V70 XC AC Blower V70-XC70

The AC compressor works fine. When I first start the car, the blower comes on and blows cold air for about 5 seconds. It then shuts off and doesn't come back on. When I drive down the road with the windows closed and the sun roof open, cool air comes out of the vents when I shut the sun roof air circulation stops. I tried replacing this list; blower motor, ECU cabin air, temp sensor near the blower. The only thing left is the interior temp sensor.
Can the ECU be reprogrammed ? What else could it be ?






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